Try the Valcom 2901 (1 door) or 2904 (4 door) entry systems. The devices are designed for connection to a dedicated telephone or connected to an analog PBX port. A visitor presses a button on the entry speaker which dials a configured extension. Whomever answers the call can talk to the visitor and ...

Are there plans to port the Brekeke PBX to Microsoft Office Communications Server API in addition to supporting TCP? It seems like it would be a good fit!